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비관측요소모형을 통한 주택의 기대가격상승률 추정에 대한 연구 -전월세전환율을 이용하여-
김순용 ( Soon Yong Kim ) 한국부동산분석학회 2016 不動産學硏究 Vol.22 No.1
This study estimates the expected growth rate in housing prices to better understand movement in housing prices. The results show that expected growth rate follows AR (1), in addition to a random walk instead of moving in regular intervals. Also, this expected growth rate exhibits both stable and unstable components. The former could be used to estimate the expected price growth rate while the latter suggests that expectations for housing price growth move stochastically every time. In addition, changes in external conditions affecting the housing market at a particular point in time continue to affect the expected price growth rate. The expected growth rate in Korean housing prices continues its downward trend. If this low growth rate in expected prices persists and there is no significant change in the housing sales market, the housing rental market will expand. Therefore, the Korean government should create legal or institutional policies that can ensure a stable residential environment for tenants.
발전소 전력계통 계기용변압기(VT) 신뢰성 향상을 위한 연구
김순용(Soon-Yong Kim),박진엽(Jin-Yeub Park),정필범(Pil-Bum Jeong) 대한전기학회 2020 전기학회논문지 P Vol.69 No.1
Voltage Transformer supplies Low Voltage Signals that are step downed from High Voltage to Voltage Meters and Protective Relays. The failures of Voltage Transformers cause to occur Trip events in Power Plants. This study analyzes the failure mechanism and possibility in the VT Design & Manufacturing process . And also, this study reviews the effects of the Switching Surge and Ferro Resonance that are occurred when the Circuit Breakers are opening/ closing in the operating environments. and then proposes an improved methods to make the Voltage Transformer with high reliability.
발전소 고압배전계통 계기용변압기 Fuse 손상 메커니즘 및 대책
김순용(Soon-Yong Kim),박진엽(Jin-Yeub Park),정필범(Pil-Bum Jeong) 대한전기학회 2020 전기학회논문지 Vol.69 No.10
Power Fuses that are installed to protect for Voltage Transformer had been burnt out by operating environments, the characteristic of fuse and aging in power plants. To analyzes the root causes of fuse failures, this study reviews the appropriateness of the fuse selection according to the VT rating and capacity, the effects of inrush current that may occur during VT power up and the possibility of resonance due to poor VT excitation characteristics. In addition, the internal condition and the blown-off melt shape of the burned-out fuse were confirmed by the industrial X-ray, the electron microscope, and the material analysis.